What does it do: Provides visual indication if crenellations upgrade is researched (see screenshot for before/after)
How to install: Extract the stuff to your installation folder for AoM (Example: C:\Games\Age of Mythology)
How to uninstall: Delete tower_anim.txt file in anim folder in AoM installation folder
Works on Vanilla?: Yes, Vanilla/Titans (extended edition too)
Crenellations upgrade is very powerful and strong deterrent to any raiding as it means a difference between 5 RC/Hippikon running wild under tower fire and 2 RC/Hippikon dead just from one run near the tower - so..
You want to know when it's researched as soon as possible to maybe switch to boom and avoid towers. With this mod you can even see when it's researched in fog or war - no more clicking on tower and checking upgrades.
This mod is very simple and is just 1 file so there shouldn't be any conflicts.